2-7

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Endothermic & Exothermic Reactions Lab<---Previous Assignment - Next Assignment--->

Time Length
  • 1 Day

Instructions
You must have goggles on your face the whole time, and you may not sit down.

Digital Handout

Reaction 1 - Citric Acid plus Baking Soda
  1. Create a new page on your website titled "2-7 Exothermic Endothermic Lab"
  2. Plug in the Temperature Probe.
  3. Open logger pro
  4. Place a Styrofoam cup into a 250-mL beaker.
  5. Measure out 30 mL of citric acid solution into the Styrofoam cup. Place the Temperature Probe into the citric acid solution.
  6. Weigh out 10.0 g of baking soda using a 50 ml beaker and a triple beam balance. (remember to find the weight of the beaker first, then add 10 grams to the scale. Slowly add baking soda to relevel it)
  7. Click the clock icon. input 100 seconds for the length and 3 seconds/sample (not samples per second)
  8. Press the green collect button and after about 20 seconds have elapsed add the baking soda to the citric acid solution. Gently stir the solution with the Temperature Probe to ensure good mixing.
  9. Rinse out cup with a lot of water in the sink. Wash cup with soap and paper towel. Dry and reuse for next experiment. Wash all glassware in the same way.
  10. Rinse and dry temp probe (steel end only)
  11. Write down what the lowest and highest temperatures were on your wiki and at what times they occurred. (consider the second you mixed the chemicals time zero)
  12. Describe what the graph looks like

Reaction 2 - Hydrochloric Acid Plus Magnesium
  1. Click the clock icon. input 240 seconds for the length and 3 seconds/sample (Not samples per second)
  2. Get 5 grams of magnesium using a 50 ml beaker and a triple beam balance.(remember to find the weight of the beaker first, then add 3 grams to the scale. Slowly add magnesium to relevel it)
  3. Using a 100 mL graduated cylinder CAREFULLY Measure out 20 mL of HCl solution into the Styrofoam cup.
  4. Put the cup into a 250 mL beaker
  5. Place the Temperature Probe into the HCl solution.
  6. Press the green collect button and after about 20 seconds have elapsed add the magnesium to the hydrochloric acid solution. Gently stir the solution with the Temperature Probe to ensure good mixing.
    1. Caution: Do not spill.
    2. Caution: Do not breathe the vapors.
  7. Rinse out cup with a lot of water in the sink. Wash cup with soap and paper towel. Dry and reuse for next experiment. Wash all glassware in the same way.
  8. Rinse and dry temp probe (steel end only)
  9. push the "A" icon to resize the graph.
  10. Write down what the lowest and highest temperatures were on your wiki and at what times they occurred (consider the second you mixed the chemicals time zero)
  11. Describe what the graph looks like.


Teacher notes
  1. Hcl 80 mL per Liter (2 Liters)
  2. Citric Acid 40g per Liter (2 Liters)